Engine piston



March 10, 1925. 1,528,989 A. v. POURROY ENGINE PISTON Filed July 24. 1922 A TTORXEY Patented Mar. 10, 1925.

PATENT OFFQICEI.

ARMANI) V. POURROY, OF OAKLAND, CALIFORNIA.

ENGINE PISTON.

Application filed July 24, 1922. Serial No. 576,952.

To all whom it my concern:

Be it known that I, ARMAIQ'D V. POURROY,

a citizen of the United States, residin at 2914 East 19th Street, in the city of a i land, county of Alameda, and State of Cahfornia, have invented a new and useful Engine Piston, of which the following 1s a specification. p

This invention relates to engme pistons, 10 and is more particularly, an improvement on the piston for which I have already applied for Letters Patent, to wltz application, Serial No. 549,985,'filed April 6, 1922. The present invention is designed to' secure substantially thesame objects therein enumerated, and also a much greater simplicity of construction, and consequently, a reduced cost of production. I a

To the above ends I construct the iston of three principal parts, two of who may be die-castings and the th1rd a sheetimetal shell. The said shell is of such form that 1t can be easily drawn, or spun. To these parts I add fastening means, for securing them together, and also rovlde for a wr1st pin to make the inventlon effective in an en ine.

or the better understanding of my invention, I have illustrated an embodiment of it in the accompanying one sheet of drawings, in which: I

Figure 1 is a central longitudinal sectional elevation of a complete piston, with a wrlst pin in place. 1 Figure 2 is a s1m1 ar section, but showing only the frame or interior skeleton at right angles to the position in which it appears in Figure 1. p

Figure 3 is a cross aectional view of F1 4o ure 2, taken on the line A-A and looking in l the direction oi the arrows.

Figure 4 is a bottom plan view of F gure 1.

Referring to the drawings My piston is composed of three members,-one of which is a seamless shell of sheet metal. This shell comprises a cylindrical end portion 1, and a cup-shaped portion 2 of smaller diameter,

but integral with it. The shell member may be formed by drawing as in dies, or by spinning, or otherwise.

meta is a cup-shaped member 3,.pref- Ca pinfi the'cup-shaped end 2 of the sheet Fshe erably a die-casting, having cylindrical outer walls approaching in diameter that of the outer diameter of body 1. Thiscasting is provided with grooves 4, adapted to receive piston rings, which, being well known devices I have thought it unnecessary to .show them.

Within the sheet metal member is a yoke or frame member, comprising a head portion 5 at one end, a. ring portion 6 at the other end, and arms 7 connecting these two parts. The parts of the yoke are all integral .with each other, and may beformed by die-casting, thus reducing machining to a minimum. The yoke is formed with opposing bosses 8 joining its ring portion, and are perforated to receive a wrist pin 9, indicated 1n Figures 1 and 4.- The ring portion .6 may be divided as at 10, to accommodate expansion and contraction.

The cap, the shell and the oke may be secured together by bolts 11, t rough those parts at the closed end of the piston, as seen in,Figures land 4.

Atri artite piston thus constructed, is exceedlng y light, simple and efficient; it requires little or no machining inits product1on, and any of the parts can be renewed ,without discardingthe others.

In the drawings, I have shown but one specific form of in invention, but it is to be understood that the invention may be embodied in other different forms, each bein a species of my invention, and the patent protection that I desire, is all of that which comes within the spirit and scope of what I claim as new, and which clalms are the following:

1. A piston having a piston-ring carrying member,'a wrist pin and supporting member therefor in the form of a cast yoke havmg a r1n -base, means securm said members toget er, and a sheet-metal ody adapted to be secured therebetween and in contact piston, comprising, a shell consisting the said shell and cap, the said yoke roof said cylindrical body, and an interior vided with a split ring base to accomm ate supporting yoke of die-cast material, the 10 expansion and contraction. said yoke provided with a ring base adapted 3. A piston, comprising, a drawn shell to contact and support the body of said shell. 5 consisting of a cylindrical body provided In tesptlmony whereof, I afiiX my g with an integral reduced cup-shaped. end, :1 mm cap of die-cast material fitting over said reduced end and of diameter approaching that ABMAND V. POURROY. 

